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American Journal of Health-System Pharmacy, Vol 57, Issue suppl_2, S4-S9
Copyright © 2000 by American Society of Health-System Pharmacists

Articles

Area under the inhibitory curve and a pneumonia scoring system for predicting outcomes of vancomycin therapy for respiratory infections by Staphylococcus aureus

PA Moise, A Forrest, SM Bhavnani, MC Birmingham, and JJ Schentag


Treatment factors predictive of clinical and microbiological outcomes and the relationship between a pneumonia scoring system and clinical outcomes in vancomycin-treated patients with a Staphylococcus aureus-associated lower-respiratory-tract infection (LRTI) were studied. A computer database review identified patients for whom S. aureus was isolated from a respiratory-tract specimen between January 1 and December 31, 1998, and who had antimicrobials ordered within 72 hours of isolation of that organism. Through further review of individual patient charts, this group was restricted to those treated with vancomycin for a documented S. aureus-associated LRTI. Classification-and-regression-tree (CART) modeling was performed to determine which clinical variables were correlated with clinical outcomes and microbiological outcomes. Median changes in clinical pneumonia scores from baseline in two patient groups (those with clinical success and those with clinical failure) were compared. Seventy patients met the study criteria. CART modeling found that both outcomes were associated with area under the inhibitory curve (AUIC). The pneumonia scoring system was predictive of eventual clinical success as early as day 3 of treatment; having at least a 4-point decrease in the pneumonia score by day 3 was correlated with an 87% clinical success rate. Both AUIC and a pneumonia scoring system were useful for predicting clinical and microbiological outcomes of vancomycin therapy in patients with LRTIs caused by S. aureus.
 



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